Affordable Access

Publisher Website

Anin situRaman study of the intercalation of supercapacitor-type electrolyte into microcrystalline graphite

Authors
Journal
Electrochimica Acta
0013-4686
Publisher
Elsevier
Publication Date
Volume
52
Issue
2
Identifiers
DOI: 10.1016/j.electacta.2006.05.053
Keywords
  • In Situraman Microscopy
  • Graphite
  • Electrochemical Intercalation
  • Et4N+
  • Bf4−
  • Supercapacitors
  • Sem
Disciplines
  • Chemistry

Abstract

Abstract An initial Raman study on the effects of intercalation for aprotic electrolyte-based electrochemical double-layer capacitors (EDLCs) is reported. In situ Raman microscopy is employed in the study of the electrochemical intercalation of tetraethylammonium (Et 4N +) and tetrafluoroborate (BF 4 −) into and out of microcrystalline graphite. During cyclic voltammetry experiments, the insertion of Et 4N + into graphite for the negative electrode occurs at an onset potential of +1.0 V versus Li/Li +. For the positive electrode, BF 4 − was shown to intercalate above +4.3 V versus Li/Li +. The characteristic G-band doublet peak ( E 2g2( i) (1578 cm −1) and E 2g2( b) (1600 cm −1)) showed that various staged compounds were formed in both cases and the return of the single G-band (1578 cm −1) demonstrates that intercalation was fully reversible. The disappearance of the D-band (1329 cm −1) in intercalated graphite is also noted and when the intercalant is removed a more intense D-band reappears, indicating possible lattice damage. For cation intercalation, such irreversible changes of the graphite structure are confirmed by scanning electron microscopy (SEM).

There are no comments yet on this publication. Be the first to share your thoughts.